Question

As a pendulum swings from the bottom position to the top position _____. potential energy is changed into kinetic energy kinetic energy is changed into potential energy mechanical energy is changed into radiation radiation is changed into friction

Answer 1

Dear Student ,

We know that , gravitational potential energy=mg∆hNow mass =m=density×volume=ρ×VSo ,gravitational potential energy=mgh=ρ×V×g×(h2−h1)Thus here gravitational potential energy is written as ∆U=ρVg(h2−h1)
Hope this explanation helps you .
Regards

Answer 2

this is the law of the conversation of energy i.e the total energy of the body remains conserved
here according to your question the mechanical energy is converted into radiation and friction these both are in the form of heat